Charles e



C. E. WEH'N.

l PENclL. .APPLICATION FILED FEB. 9, 1920.

Patented Aug. 23, 1921.l

INVFNIOR I /zalies lofV ahandleand lis provided with an end UNITED STATES PATENT OFFICE.

CHARLESE. WEHN, OF ALAMEDA, CALIFORNIA., ASSIGNOR TO LISTO PNCIL COM- PANY, 0F ALAMEDA; CALIFORNIA, A CORPORATION OF CALIFORNIA.

PENCIL.

Specication of Letters Patent.

Patented Aug. 23, 1921.

Application led February 9, 1920. Serial No. 357,390.

To all whom t may couccm:

Be itknown that I, CHARLES E. W'EHN, a citizen of the United States, residing at Alameda, in thecounty of Alameda and State of California, have invented a new and useful Improvement in Pencils, of which the following is a specification.

This invention relates to a pencil and especially to improvements on `the structure shown in my former patent,'entitled Pencil, No. 1,302,999, issued May 12, 1919.

One ofthe objects of the present invention is to providev a pencil which is simple and substantial in construction, cheap to manufacture, easy to manipulate and so arranged that the lead may be readily changed or replaced when worn.

Another object of the invention is to provide means for advancing the lead and particularly a novel form of screw feed mechanism for gradually advancing the lead as the point becomes worn.` f

Further objects will hereinafter appear.

The invention consists of the' parts and the construction, j combination and arrangement v ofp'arts ash'ereinaftermore fullydescribed section throughthe same.

' mechanism. 1'

i .the like.

and claimed, having reference to the-accompan'ying drawings," vin which-'- Figure yl'isV a sideelevat-ion of the'pencil. Fig.` 2- is a central'- verticalV longitudinal Fig. 3 isardetailed view of thelscrew feed rig. 41S an @nu viewer rig. s. Fig. 5'is a detailedfview of the lead re- Fig. 6 is across section on line 6 6, Fig. 2.

l Referring to the drawings in detail, indicates in general a pencil 'which in this in-V stance consists ofA a central cylindrical section 2, and 'a pair of end sections 3 and 4: The

central section 2 supports a screw feed mechanism hereinafter to 'be-described, while the tapered endsection carries a lead holder 5.

The upper end section 4 servesthe function chamber 6 for thereception'of spare leads or VThe central section 2 is preferably constructed of metal or'other similarlsubstantial *material It is cylindricalV in cross section 'and is provided with a pair of' opposed open- :ings fito exposeanutrSi'mounted therein. This `rnut '8 isv turnablymounted within 'the S is thereby prevented.

central section 2, but it is secured against endwise movement at one end by a partition wall 9 of the section 2, and at the opposite end by a shoulder 10 of the section 4. The shoulder 10 is formed on the end section 4 and forms a reduced end thereof by which` connection is made between the sections 2 and 4.

Carried by the nut 8 and extending therethrough is a screw rod 11. This rod is secured against turning movement and is moved in one direction or the other by means of the nut 8. When advanced in one direc- -tion the screw rod 11v enters the chamber 12 formed in the section 3 and when moved in the opposite direction enters the chamber 14 formed in the section 4. The movement of the screw rod 11 in either direction 1s limited, its movement into chamber 14 being limited bya partition 15, which forms a bottom for the lead receiving chamber 6, and its movement in the opposite direction into chamber 12 is limited by the inner end of the lead holder 5. It is therefore impossible to advance kthe screw 11 more than a predetermined distanceY in each direction, land separation of screw 11 with relation to the nut `To prevent turning movement of the screw rod 11, a flattened ,surface 16 is formed on one side thereof. This surface 16 extends from end to end of the screw rod 11. By referring to Fig. 2, it will be seen that the screw rod 1 1 passes through the'partition member 9. The

opening formed in this member is noncircular as shown at 17 (see Fig. 6) and it therei fore serves as a guide for Vthe screw rod 11 anda means for securing the same against turning movement. Turning f movement transmitted to the nut 8 will therefore only 4advance or retract the screw 11 longitudinally with respect to section 2. Formed on the forward end of and in aXial alinement with the screw'rod 11 is a pin 18. This pin 18 passes through the chamber 12 formed 1n the'section 3 and enters a passage 19 formed inthe lead receiver 5. A lead 25 placed in vthe receiver 5 will therefore be Ladvanced when the screwl rod 11 is moved in the direction of arrow a of Fig. 2 and it is therefore 'possible to readily advance the lead 25 as it becomes worn. The lead receiver 5 is preferably constructed ofmetal. yIts inner end is eXteriorly threadedras at 20 to engage threads z formed on the interior of and near the forward end of the chamber l2 and its outer end is tapered and split as at 2l to frictionally engage the lead 25. rlhe receiver 5 is also shouldered as at 22 to permit it to be readily grasped and turned when it is inserted into or removed from section 3.

From the foregoing description it can be seen that a pencil of simple and substantial construction has been provided, said pencil consisting of a central section and a pair of end sections, the central section serving as a support or container for the screw feed mechanism, the lower end section, the function of a lead receiver, and the upper section the function of a handle and a spare lead receiver. The nut carried by the centralpsection may readily be turned and engaged by the lingers to turn it in one direction or the other, due to the openings 7 formed therein and it is therefore possible to advance a lead, when worn, by merely transmitting a turning movement to the nut. The end sectionsB and 4 are preferably cemented or otherwise secured with relation to the central section 2 and when so secured form an integral' structure which cannot be separated. This is of importance as it prevents tampering with the interior mechanism. The only part that can be removed is the lead receiver 5 and a removable cap 2d by which the outer open end of the spare lead receiving chamber 6 formed in the upper end of section Ll is closed. In fact itisnot necessary to remove the lead receiver 5 as the rod 18, formed on the end of the screw 16, is suliiciently long to project through receiver 5. This insures a complete discharge of the worn lead andV it similarly permits a new lead to be inserted from the outer end 2l of the lead receiver 5 when the fl()V screw rod l1 is completely retracted within secti ons 2 and 4;.

l-lavingthus described my invention, what I claim and desire to secure by Letters Patent isf l. A pencil comprising a hollow cylindrical shell, said shell being pointed at one end and having a central'lead receiving passage formed therein, a screw rod within the shell in alinement with the lead receiving passage, a flattened surface formed on one side of the screw rod and extending from end to end thereof, a nut turnably mounted on the screw rod, A a partition member within the shell formed with an opening through which the screw rod extends, said opening having a periphery complement-al to that of the screw rod whereby said screw rod is free to move longitudinally but held against turning movement.

2. In a device ofthe character described ,A the combination with avfeeding nut, of

screw rod extending therethrough, said screw rodhavmg a flattened surface formed on one side and extending from end to end,

a guide member associated therewith comprising a member disposed transversely to the screw and having an opening complemental to that of the screw whereby said screw is permitted to move longitudinally but held against turning movement.

3. A pencil comprising a hollow cylindrical shell', said shell being pointed at one end and having a lcentral lead receiving passage formed therein, a screw rod within the shell in alinement with the lead, a pin on the forward end of the screw rod engageable with the lead and adapted to enter the lead receiving passage, a nut turnably mounted on the screw rod, a key-way on the screw rod, and a member in the shell engaging the key-way to secure the screw rod and the pin carried thereby against turning movement.

l. A pencil of the character" described, comprising two tubular end sections and an intermediate tubular section. to which said end sections are secured, and one end section being tapered and having a lead passage formed therein, an interiorly threaded nut carried by the intermediate section and turnable therein, a threaded rod adapted to be advanced or retractedgby said screw, said threaded rod having a flat surface extending from endto endV thereof, and a partition wall adj acent the screw having an opening formed therein through which the threaded rod may pass, said opening having aperiphery formed with a fiat surface complemental to that of the threaded rod whereby the rod is permitted to move longitudinally but held against turning movement. l

5. A pencil of the character.v described comprising two tubular end sections and an intermediate tubular section, one end section being tapered and having a lead receiving passageway formed therein, an interiorly threaded nut carried inthe intermediate section and turnable therein, means for holding said rod against longitudinal movement, a threaded rod adapted to be advanced or retracted by said screw, said rod having a llat surface extending from end toy end thereof, a partition wall adjacent the screw having an opening throughl which the threaded rod may pass, said opening having a periphery formed with a flat surface complemental to that of the rod whereby said rod is permitted to move longitudinally but held against turning movement.

6. A pencil comprising a hollow cylindrical shell, said shell being pointed at one end and having a central lead receiving passage formed therein, a screw rod within the shell in alinement with the lead receiving passage, a flattened surface formed on one side of the screw rod and extending. from end to end thereof, a nut turnably mounted on the screw rod, a partition member within the shell formed with an opening through which the l a pair of tubular sections, a comparatively short intermediate tubular section interposed between the rst named tubular. sections and connecting the same, a nut wlthin the intermediate section supported thereby and turnable therein, a screw rod extending through the nut, and means in the intermediate tubular section for guiding the rod and securing it against turning movement.

, 8. In a pencil of the character described a pair of tubular sections, a comparatively short intermediate tubular section interposed between the first named tubularl sections and connecting the same, a nut within the intermediate section supported thereby and turnable therein, a screw rod extending through the nut, means in the intermediate tubular section for guiding the rod and securing it against turning movement, and a pair of opposed openings formed in the intermediate tubular section to permit the nut "to be grasped and turned.

9. A pencil of the character described comprising a pair of tubular shell sections of `approximate equal length, a comparatively short intermediate tubular section connecting the same, a nut within the intermediate section supported thereby and turnable therein, a screw rod extending through thel nut and entering the tubular shell sections, a flattened portion on the rod extending from end to end thereof, an end plate secured in the intermediate tubular section, an opening formed in said plate forming a guide for the screw rod and securing the screw rod against turning movement, a plunger on the forward end of the screw rod and a lead receiving member carried by one of the tubular shell sections into which the plunger rod extends.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

CHARLES E. WEHN. Witnesses:

W. -W. HEALEY,

M. E. EWING. 

